Fan



Jan. 2, 1940. ANDERSON 2,185,718

' FAN Filed June 24, 193e v 2 sheets-sheet 1- Jan. 2,y 1940. E. L.ANDERsoN FAN z'sheets-sheet 2 Filed June 24, 1956 Mln-wma v BywA/ra L.Amai/9.50m

2 ,I Y r .l Afro/Mins Patented Jan. 2, 1940 UNITED STATES".

PATENT OFFICE FAN Edward L. Anderson, Detroit, Mich., assigner toAmerican Blower Corporation, Detroit, Mich., a corporation of Delaware vApplication June 24, 1936,' sei-lai No. 81,632

18 Claims.

My invention relates to air handling apparatus and in particular to ameans and method of sound absorption of air handling fans, cas- -ingsand ducts associated therewith.

It is my object to provide in a unit adapted to heating, cooling andhumidiflcation, a fan '15 less as possible. I ,n

It is the object of my invention to provide a fan having a high 'speedand relatively high velocity outlet of air that will be noiseless, whileat thesame time permitting the fan to travel at its most eflicientspeed.

Referring to the drawings:

Figure 1 is a top plan view of a unit embodying my invention with themetal enclosing'casing in section, a portion of the radiator in section,

and a portion of the fan outlet chamber in section. 'I'hesection'of'llgure'l is taken on the line I--I oi Figure 3. A

, Figure 2 is a section on the line 2-2 oi.' Figure 1.

Figure 3 is a section on the line 3-3 looking in I.

the direction of the arrows of Figure 1.

Referringl to the drawings in detail, I designates the bottom of a metalcasing which has the top 2 and sides 3 and I. An end 5 is provided 35withan air inlet 6 in which is located a filter 1. The airpasses'through the filter and then through the humidifying chamber 8having a humidifying spray nozzle 9 and baille plate I0. The air thenpasses through' the radiator II, which may either be for cooling orheating purposes; and thence into the fan chamber I2. 'I'he bottom ofthis chamber is inclined at I3 so that any entrained` moisture `maydrain away through the pipe I 4. l

Within the air inlet chamber I2 vis mounted theO fan casing I5 in whichis located alan I6 mounted on the shaft I1 that carries a pulley I8which is driven by a belt I8 from a smaller pulley 20 on the armature 2Iof an electric 50 motor 22. The lateral dimensions of this vortex i fancasing I5 are small in comparison with the' lateral dirnension'soi' thechamber I2. The cover of the chamber I2 is inclined as at 23.

'Ihe sides 'of the fan casing I5 are provided u with air inlet openings24, through which the substantially noiseless.

(cieco-233) s air enters and is then delivered by the fan I6 from thecasing I5 tangentially through the outlet opening into the outletpassageway 28.

This passageway is lined with a sound deadening material 21. Thepassageway expands ver- 5 tically and laterally as indicated by theposi- Vtioning of the upper wall 28 and lower wall 29,

which progressively are further apart as the air progresses away fromthe fan I6. The angular y wall 30 actsas'a baiile wall torfdirecting the10 air into the passageway 26r i The side walls ofthe passageway l3l andv32 likewise are progressively further apart towards the air outlet 33.These side walls are likewise insulated with the sound deadeningmaterial 21. l

The course of the air is ilrst through the iilter 1 after enteringthrough the passageway 6, thence through the humidifying chamber 8,radiator II, into the relatively large chamber I2,A

whence the air enters through the air inlet open- `20 ing 24 into theeye of lthe fan and is discharged from the `casing I5 through theopening`25 into the sound insulated, vertically and laterally expandingpassageway 2&6, whence it leaves through the opening 33. 25

Despite the fact that this fan is operating within a thin sheet metalcasing which emphasizes any noise and handles a large volume of air withan air discharge at a substantial velocity, nevertheless the operationof the unit is 80 This is due to the arrangement of the parts,particularly the air outlet. I

The insulation 21 which is parallel to the rear wall 30 is held inposition as it rests upon' the .ll flange 30a at its bottom and againstthe adjacent edge at its top of the 'top lining 21a. 'I'he forward endvof the topl lining 21a engages with the wall 28a, which forms a recessfor receiving the lining 21a. s tion on the wall 29, which insulation isdesignated 29a, is likewise inserted behind the shoulder 29h at itsforward end and is overlapped and engaged at its rear end by the lipI5a,of the fan casing I5 which is suspended from the top 23 of -45 theair inlet chamber I2.

E It will be understood that I desire to comprehend within my inventionsuch modifications as may be necessary to adapt it to varying conditionsand uses. 50

Having thus fully describedmy invention, what I claim as new and desireto secure-by Letters Patent, is:

1. In combination, a fan and surrounding fan casing, and an extended airoutlet separate from f The lowerv covering of insulasaid fan casing andhaving a sound deadening lining material therein anddisposed in partbetween portions of said air outlet and said fan casing and providingsupport for a part of said fan casingon said air outlet.

2. In combination, a fan and fan casing, and an extended air outlet withprogressively expanding side, top and bottom walls and having a sounddeadening lining material therein, said outlet being arranged at anacute angle to the line of discharge of the air from the fan casing; andhaving an angular positionedf baille wall for directing air into saidextended outlet.

3.`In combination, a fan casing, a fan therein adapted to dischargeupwardly through the top side of said casing, and an air outletpassageway disposed at an acute angle to the direction of fan dischargeand communicating with said casing comprising top, bottom and side wallsprogressively expanding from the inlet to the outlet passageway to theoutlet thereof and provided with an interior sound absorbent lining,said outlet passageway wall comprising a sound insulated annular sectionpositioned adjacent said fan for directing vthe air discharged therefrominto said expanded outlet passageway.

4. -In combination, an air inlet chamber a fanv casing located thereinand communicating therewith, a fan in said fan casing, a substantiallyhorizontal discharge passageway communicating with said fan casing anddisposed at an acute angle to the discharge of said fan, said dischargepassageway being progressively larger from its inner end towards itsouter end comprising a vertically andlaterally expanding opening andhaving therein a lining of sound-deadening material. l

5. In combination, an air inlet chamber, a fan casing suspended thereinfrom th'e top thereof, said fan casing having an outlet openingcommunicating with an outlet opening in the top of said chamber and saidfan casing having an air inlet opening communicating with said chamber,a discharge passageway provided with an interior sound absorbent liningand extending from said air outlet opening of the fan casingVprogressivelylarger laterally from the inlet end of the outletpassagewayto the outletend thereof,

and afan in said fan casing, aportion of said fan.

of the outlet passageway to the outlet end thereof, and a fan in saidfan casing, 'said outlet passageway being disposed substantiallyparallel to the line of ow of the air entering the first-mentioned airchamber and having the lining thereof supporting the forward edgeportion of said fan casing.

v'7. In combination, an air inlet chamber, a fan casing suspendedtherein from the top thereof, said fan casing having an outlet openingcommunicating with an outlet opening in the top of said chamber andsaidV fan casing having an air inlet opening communicating with saidinlet chamber, a discharge passageway extending from said l air outletopening of the fan casing progres-v' sively larger laterally from theinlet end of the.

outlet passageway to the outlet end thereof, andy a fan in said `fancasing, said outlet' passageway having a sound absorbent lining thereinand bechamber and at an angle to the line of discharge of the air by thefan from the fan casing and said fan casing having one edge supported'bysaid outlet passageway and insulated therefrom by a portion of thelining thereof. 8. A new article of manufacture for usev as a fandischarge passageway comprising a casing adapted to be horizontallydisposed and having laterally diverging fiatv side walls and divergingflat top and bottom walls, with an air inlet opening in the bottom walland a fixed wall portion diagonally disposed across the end of thecasing over the air inlet opening thereto for directing the air intosaid fan discharge passageway.

9. A new article of manufacture for use as an air outlet passagewaycomprising a substantially horizontal passageway having diverging sidewalls and diverging top and bottom walls, said diver-` gence takingplace from the inlet to the outlet end of .the passageway, saidpassageway having an air inlet opening on the bottom of the inlet end, axed wall portion diagonally disposed across the inlet end over the airinlet opening,

ingwith the air inlet chamber suspended in the air outlet opening of theair inlet chamber -and communicating therewith, a fan in lthe fan'casing, and an angularly disposed, expanding discharge casingassociated with the fan casing -outlet whereby the air dischargedtherefrom has its side beginningsubstantially as a continuation of thespiral of said outer wall and extending as a plane surface,divergingfrom the first side at an acute angle with respect thereto, and twoother sides, the last two sides being divergently disposed so as to forma rectangular conduit progressively increasing in cross-sectional areaat a greater rate` than that of the space between the periphery of saidwheel and said housing, the length of saidY discharge casing withrespect to having an impeller wheel, a housing including aspiral outerwall adjacent to the periphery of the wheel, and a discharge outletlying in aplane approximately tangential to the periphery of the wheeI,said casing including aside. lying mlthe plane of said discharge outlet.an opposed side beginning-substantially as a continuation or the spiralof said outer wall and extending as vaplane surface diverging from thefirst side at an acute angle with respect thereto, and twoy other sides,the last two sides beingdivergently disposed so as to form'arectangularconduit progressively increasing in cross-sectional area at a greaterrate than that of the space between the periphery of said wheel and saidhousing, the length of said discharge casing with respect to the lengthof said discharge outlet being such that substantially all atmosphericvibrations within the sonic range originated by said impeller wheelimpinge upon a side of the casing at such angles that the majority ofsuch vibrations may be reflected against another side of the casing.

13. A discharge casing for a wheel type blower having an impeller wheel,a housing including a ,spiral outer wall adjacent to the periphery ofthe wheel, and a discharge outlet lying in a plane approximatelytangential to the periphery of the wheel, said casing including a sidelying in the plane of said discharge outlet, an opposed side beginningsubstantially as a continuation of the spiral of said outer wall andextending as a plane surface diverging from the first sideat an acuteangle with respect thereto, two other sides, the last two sides beingdivergently disposedso as to form a rectangular 'conduit progressivelyin- I creasing in cross-sectional area at a greater rate than that ofthe space between the periphery of said wheel and said housing, thelength of said discharge casing with respect to the length of saiddischarge outlet being such that substantially all atmosphericvibrations within the sonic range originated by said impeller wheelimpinge upon a side of the casing, and sound-absorbing material formingat least the inner surfaces of said sides.

14. A discharge casing for a wheel type blower vhaving an impellerwheel, a housing including a outer wall adjacent to the periphery ofspiral the wheel, and a discharge outlet lying in a plane approximatelytangential to the periphery of the wheel, said casing including a sidelying in the plane of said discharge outlet and an opposed sidebeginning substantially as a continuation of the spiral of said outerwall and extending as a plane surface diverging from the rst side at anacute angle with respectl thereto, two other lpeller Wheel periphery ofsaid wheel and said outer wall, the

length of said dischargeasing with respect to the length of saiddischarge outlet being such that substantially all atmosphericvibrations within the sonic range originated by said imimpinge upon aside of the casing at such angles that the majority of such vibrationsmay be reected against another side of the casing, and sound-absorbingmaterial forming at least the inner surface of said sides.

15. in combination, a fan and fan casing, and an extended air outletwith progressively expanding side, top and bottom walls and having asound deadening lining material therein to form sound deadening walls,said outlet being arranged at an acute angle to the line of discharge ofthe air from the fan casing, in which all lines of discharge from thefan intersect a sound deadl ening wall of the discharge passageway.`

16.` 1n combination, a fan rotor and fan casing having an extended airoutlet with pairs of oppositely spaced progressively expanding sounddeadening walls constituting an extended air outlet disposed at an acuteangle to the line of discharge of air from the said fan casing and beingarranged `so that all lines of discharge from the fan intersect a sounddeadening wall in said passageway.

17. In combination, a fan rotor and fan casingv having an extended airoutlet with sound deadening Walls progressively expanding in alldirections to form a passageway and constituting an extended air outletdisposed at an acute angle to the line of discharge of air rom the saidfan casing and being arranged so that all Alines of discharge from thefan intersect a sound deadening wall in said passageway.

18. In combination, a fan rotor and a fan casing, an extended air outletin the form of a hollow truncated pyramid having sound deadening walls,said fan and fan casing adapted to discharge therein and being locatedadjacent the Y apex end of said' pyramid, said fan being so located withrespect to the pyramid that all lines of discharge from the fanintercept a sound deadening wall of the pyramid.

' EDWARD L. ANDERSON..A

